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This Defense Intelligence Reference Document (DIA-08-1003-018), dated 30 March 2010, was produced by the Defense Intelligence Agency as part of its FY 2009 Advanced Aerospace Weapon System Applications (AAWSA) Program. It reviews theoretical approaches to antigravity for aerospace propulsion, drawing on Newtonian physics, general relativity, cosmological dark energy and quantum vacuum effects. The report notes that no current technology can actively control gravity and that many concepts are far from practicable engineering.
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UNCLASSIFIED//FIHl &FFlill k YEE ODIi Y weaker fluctuations and thus less energy density than the vacuum at locations where cos 2[oi(t- z/c)] ~ 1 and sin 2 [co(t - z/c)] sinh S is met. It turns out that this is always true for every nonzero value of S, so PE-,4,." becomes negative at some point in the cycle for a general squeezed vacuum state. On another note, when a quantum state is close to a squeezed vacuum state, there will almost always be some negative energy densities present. GRAVITATIONALLY SQUEEZED ELECTROMAGNETIC ZERO-POINT FLUCTUATIONS A natural source of negative energy comes from the effect that gravitational fields (of astronomical bodies) in space have upon the surrounding quantum vacuum. For example, the gravitational field of the Earth produces a zone of negative energy around it by dragging some of the virtual quanta (aka vacuum ZPF) downward. This concept was initially developed in the 1970s as a byproduct of studies on quantum field theory in curved space (Reference 37). However, Hochberg and Kephart (Reference 33) derived an important application of this concept to the problem of creating and stabilizing traversable wormholes. They showed that one can utilize the negative energy densities, which arise from distortion of the vacuum ZPF due to the interaction with a prescribed gravitational background, for providing a violation of the energy conditions. The squeezed quantum states of quantum optics provide a natural form of matter having negative energy density. The corresponding local vacuum state energy density ispE-i:"•" =-2nchc//c.j, where/, is the ZPF mode wavelength under consideration in the gravitational squeezing effect (Reference 70). The analysis, via quantum optics, showed that gravitation itself provides the mechanism for generating the squeezed vacuum states needed to support stable traversable wormholes. The production of negative energy densities via a squeezed vacuum is a necessary and unavoidable consequence of the interaction or coupling between ordinary matter and gravity, and this defines what is meant by gravitationally squeezed vacuum states. One is presently unaware of any way to artificially produce 30 UNCLASSIFIED//r;Oll oi;i;1,;;1•k llili O•lk¥
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 44 pages are in the text index: search them above, or from the library's search.